/*
 * Created on Jun 24, 2005
 */
package org.flexdock.docking.adapter;

import java.awt.Component;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.swing.Icon;

/**
 * @author Christopher Butler
 */
public class DockingAdapter {
	private static final Class[] EMPTY_PARAMS = {};
	private static final Object[] EMPTY_ARGS = {};
	
	private Component component;
	private AdapterMapping mapping;
	
	DockingAdapter(Component comp, AdapterMapping mapping) {
		component = comp;
		this.mapping = mapping;
	}
	
	public Component getComponent() {
		return component;
	}

	public List getDragSources() {
		// first, try to get a list of drag sources
		Object obj = get(component, mapping.getDragSourceList());
		if(obj instanceof List)
			return (List)obj;
		
		// if we couldn't find a list, then try to get an individual drag source
		// and create a List from it
		obj = get(component, mapping.getDragSource());
		if(obj instanceof Component) {
			ArrayList list = new ArrayList(1);
			list.add(obj);
			return list;
		}
		
		// if both attempts failed, then return null 
		return null;
	}

	public Set getFrameDragSources() {
		// first, try to get a set of frame drag sources
		Object obj = get(component, mapping.getFrameDragSourceList());
		if(obj instanceof Set)
			return (Set)obj;
		
		// if we couldn't find a set, then try to get an individual 
		// frame drag source and create a Set from it
		obj = get(component, mapping.getFrameDragSource());
		if(obj instanceof Component) {
			HashSet set = new HashSet(1);
			set.add(obj);
			return set;
		}

		// if both attempts failed, then return null 
		return null;
	}

	public String getPersistentId() {
		Object obj = get(component, mapping.getPersistentId());
		return obj instanceof String? (String)obj: null;
	}
	
	public Icon getDockbarIcon() {
		Object obj = get(component, mapping.getDockbarIcon());
		return obj instanceof Icon? (Icon)obj: null;
	}
	
	public String getTabText() {
		Object obj = get(component, mapping.getTabText());
		return obj instanceof String? (String)obj: null;
	}

	private Object get(Object obj, String methodName) {
		if(obj==null || methodName==null)
			return null;
		
		try {
			Class c = obj.getClass();
			Method method = c.getMethod(methodName, EMPTY_PARAMS);
			return method.invoke(obj, EMPTY_ARGS);
		} catch(Throwable t) {
			// ignore.
			return null;
		}
	}
}
